Knitting needle type yarn cutting device

Abstract

The invention relates to a knitting needle type yarn cutting device which comprises a bush-hook, a fixed knife and a thread pressing reed, the bush-hook is arranged in one needle groove of a needle plate in a sliding mode, the fixed knife and the thread pressing reed are fixedly installed on the needle plate on the two sides of the bush-hook in the width direction respectively, and the fixed knife and the thread pressing reed abut against the two sides of the bush-hook in the width direction respectively. The fixed knife is located on the side, facing the center of the needle plate, of the bush-hook, a hook groove is formed in the bush-hook, a cutting opening is formed in the hook groove, a check block is installed on the fixed knife, and when the bush-hook is contained in the needle plate, the check block blocks the opening of the hook groove. The device has the effect of reducing the probability that the yarn is cut off when entering the hook groove by mistake.

Description

Technical Field

[0001] The present application relates to the field of yarn shearing equipment for flat knitting machines, and in particular to a knitting needle type yarn shearing device. Background Art

[0002] A computerized flat knitting machine is a double-needle plate latch needle weft knitting machine. Its cam mechanism acts like a set of flat cams. The needle's foot enters the cam's groove, moving the cam, forcing the needle to rise and fall rhythmically within the needle slot of the needle plate. Through the action of the needle hook and latch, the yarn is woven into a knitted fabric. As the needle rises, the yarn loop gradually exits the hook, opening the latch and withdrawing it to hang on the needle bar. As the needle descends, the hook grabs the newly placed yarn and bends it into a loop, while the existing loop escapes the hook. The new loop passes through the old loop, connecting in series. Numerous loops formed by knitting are interconnected to form a knitted fabric.

[0003] The existing computerized flat knitting machine is equipped with yarn shears at both ends of the needle plate. The yarn shears are used to cut the yarn after the knitted fabric is knitted, thereby separating the yarns of the two pieces of knitted fabric. The existing yarn shears are complex in structure and high in cost. If installed on the needle plate, it is easy to affect the operation of the yarn mouth. Therefore, our company has developed a knitting needle type yarn shearing device (refer to Figure 1 ), including a hook knife 1, a fixed knife 2 and a thread pressing spring 3, the hook knife 1 is slidably arranged in one of the needle grooves of the needle plate, the fixed knife 2 and the thread pressing spring 3 are respectively fixedly installed on the needle plate on both sides of the width direction of the hook knife 1, the fixed knife 2 and the thread pressing spring 3 are respectively abutted on both sides of the width direction of the hook knife 1, the fixed knife 2 is located on the side of the hook knife 1 facing the center of the needle plate, a hook groove 4 is opened on the hook knife 1, and a cutting opening 5 is opened on the side of the hook groove 4 facing the fixed knife 2, and the hook is driven by the triangle of the flat knitting machine head to the hook knife 1. The knife 1 starts the needle and hooks the yarn. When the hook knife 1 closes the needle, the yarn to be cut is pulled to the fixed knife 2 and the thread pressing spring 3. The thread pressing spring 3 clamps and fixes the yarn, and then the hook knife 1 and the fixed knife 2 clamp and cut the yarn to achieve yarn cutting. The existing hook knife 1 is mainly used for cutting yarn. There is no yarn loop in the hook groove 4, so the needle tongue cannot be set to block the hook groove 4. The yarn is easy to enter the hook groove 4 and be cut during knitting, which leads to yarn leakage in subsequent knitting, greatly increasing the probability of defective products. Summary of the Invention

[0004] In order to reduce the probability of yarn being cut by mistake when entering the hook groove, the present application provides a knitting needle type yarn cutting device.

[0005] The present application provides a knitting needle type yarn cutting device adopts the following technical solution:

[0006] A knitting needle type yarn shearing device comprises a hook knife, a fixed knife and a thread pressing spring, the hook knife being slidably arranged in one of the needle grooves of a needle plate, the fixed knife and the thread pressing spring being fixedly mounted on the needle plate on both sides in the width direction of the hook knife, the fixed knife and the thread pressing spring being respectively abutted against both sides in the width direction of the hook knife, the fixed knife being located on the side of the hook knife facing the center of the needle plate, a hook groove being provided on the hook knife, a cutting opening being provided in the hook groove, a stopper being mounted on the fixed knife, and when the hook knife is stored in the needle plate, the stopper is blocked at the opening of the hook groove.

[0007] By adopting the above technical solution, a stopper is provided on the fixed knife, and when the hook knife is stored in the needle plate and not in use, the stopper can block the opening of the hook groove, thereby reducing the probability of the yarn mistakenly entering the hook groove and being cut.

[0008] Optionally, the hook groove is provided with cutting openings on both sides facing the fixed knife and the wire-pressing spring, and the hook knife is detachably provided with a filling block at the hook groove, and the filling block is installed on the hook knife to block one side opening of the hook groove.

[0009] By adopting the above technical solution, cutting openings are opened on both sides of the hook groove, so that the hook knife can be applied to both sides of the needle plate. The setting of the filling block can block the unused cutting opening, reducing the impact of the cutting opening on the unused side on the fixation of the yarn after cutting.

[0010] Optionally, the stopper is slidably arranged on the fixed knife, and the stopper slides along the thickness direction of the fixed knife.

[0011] By adopting the above technical solution, the direction of the stopper on the fixed knife can be changed by sliding the stopper, so that the fixed knife can also be applied to both sides of the needle plate.

[0012] Optionally, a slider is fixed on the fixed knife, a sliding groove is provided on the stop block, the slider is slidably arranged in the sliding groove, and positioning pieces are provided at both ends of the sliding groove in the length direction.

[0013] By adopting the above technical solution, the sliding groove cooperates with the slider to facilitate the sliding of the stopper on the fixed knife. The setting of the positioning piece can position the stopper after the stopper slides, thereby reducing the probability of the stopper sliding during use.

[0014] Optionally, the positioning member includes a pressure block and an elastic member, the pressure block is slidably set in the slide groove, and the elastic member is installed between the pressure block and the bottom of the slide groove. When the slider slides to the two ends of the slide groove in the length direction, the elastic member drives the pressure block to be pressed on the slider.

[0015] By adopting the above technical solution, the elastic member drives the pressing block to be pressed on the slider, which can apply pressure to the slider after the stop block is positioned, thereby reducing the probability of the stop block slipping during use.

[0016] Optionally, the pressing block is provided with a guide angle toward the center of the sliding groove.

[0017] By adopting the above technical solution, the setting of the guide angle can drive the pressing block before the slider slides to the end of the chute, thereby reducing the probability of the pressing block affecting the sliding to the end of the chute.

[0018] Optionally, the wire pressing spring includes a mounting portion, a rotating portion and an elastic portion, the mounting portion is fixedly mounted on the needle plate, the rotating portion is rotatably arranged on the mounting portion, the elastic portion is mounted on the rotating portion, and the rotating portion rotates to drive the elastic portion to reverse.

[0019] By adopting the above technical solution, the mounting part is used to install and fix the thread pressing spring as a whole on the needle plate, the elastic part is used to clamp the cut yarn, and the setting of the rotating part can change the direction of the elastic part on the mounting part by rotating, so that the thread pressing spring can act on both ends of the needle plate, thereby improving the application range of the thread pressing spring.

[0020] Optionally, a fixing component is provided between the rotating part and the mounting part, and the fixing component includes an insertion rod and a slot. The two insertion rods are slidably provided at both ends of the rotating part in the width direction, and the slots are opened on the mounting part corresponding to the insertion rods, and the insertion rods are inserted into the slots by sliding.

[0021] By adopting the above technical solution, the setting of the fixing assembly can fix the position of the rotating part on the mounting part, reducing the probability of the rotating part rotating during use of the wire pressing spring.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By setting a stopper on the fixed knife, when the hook knife is stored in the needle plate and not in use, the stopper can block the opening of the hook groove, thereby reducing the probability of the yarn accidentally entering the hook groove and being cut;

[0024] 2. There are cutting openings on both sides of the hook groove, so that the hook knife can be used on both sides of the needle plate. The setting of the filling block can block the unused cutting opening, reducing the cutting opening on the unused side from cutting the yarn and affecting the fixation of the yarn after cutting;

[0025] 3. The direction of the stopper on the fixed knife can be changed by sliding the stopper, so that the fixed knife can also be applied to both sides of the needle plate;

[0026] 4. The mounting portion is used to fix the thread pressing spring as a whole on the needle plate, the elastic portion is used to clamp the cut yarn, and the setting of the rotating portion can change the direction of the elastic portion on the mounting portion by rotating, so that the thread pressing spring can act on both ends of the needle plate, thereby improving the application range of the thread pressing spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a knitting needle type yarn cutting device before the improvement of the present application.

[0028] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 3 It is a schematic structural diagram of the hook knife according to an embodiment of the present application.

[0030] Figure 4 yes Figure 3 Magnified view of part A in the middle.

[0031] Figure 5 It is a structural diagram of the fixed knife in an embodiment of the present application.

[0032] Figure 6 yes Figure 5 Magnified view of part B in the middle.

[0033] Figure 7 It is a structural schematic diagram of the wire-pressing spring in an embodiment of the present application.

[0034] Figure 8 yes Figure 7 Magnified view of middle C.

[0035] Explanation of the accompanying drawings: 1. Hook knife; 2. Fixed knife; 3. Wire-pressing spring; 31. Mounting part; 32. Rotating part; 33. Elastic part; 4. Hook groove; 5. Cutting opening; 6. Stop block; 7. Filling block; 8. Slider; 9. Slide groove; 10. Positioning piece; 101. Pressure block; 102. Elastic piece; 11. Guide angle; 12. Fixing assembly; 121. Insert rod; 122. Slot; 13. Driving assembly; 131. Mounting groove; 1311. Insertion groove; 1312. Rotating groove; 132. Rotating shaft; 1321. Rod body; 1322. Anti-slip block; 133. Push rod; 134. Driving rod; 135. Reset spring. DETAILED DESCRIPTION

[0036] The following is combined with Figure 2-8 This application is described in further detail.

[0037] First of all, it should be noted that in the description of this application, if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and other directional words appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application; in addition, if the terms "first", "second", "third" and other numerical quantifiers appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", and "connected" appear, they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an interference fit, a transition fit and other limited connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; therefore, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] The present application discloses a knitting needle type yarn cutting device, referring to Figure 2 , including a hook knife 1 slidably arranged in one of the needle grooves of the needle plate, a fixed knife 2 and a thread pressing spring 3 fixedly mounted on the needle plate on both sides in the width direction of the hook knife 1, and a mounting through hole is opened on the fixed knife 2 and the thread pressing spring 3. By inserting a mounting rod on the needle plate, the mounting rod passes through the mounting through hole to mount the fixed knife 2 and the thread pressing spring 3 on the needle plate, and the fixed knife 2 and the thread pressing spring 3 are respectively abutted against both sides in the width direction of the hook knife 1, and the fixed knife 2 is located on the side of the hook knife 1 facing the center direction of the needle plate, and the hook knife 1 is provided with a mounting hole. A hook groove 4 is provided with a cutting opening 5 in the hook groove 4, and a stopper 6 is installed on the fixed knife 2. When the hook knife 1 is stored in the needle plate, the stopper 6 blocks the opening of the hook groove 4. By arranging the stopper 6 on the fixed knife 2, when the hook knife 1 is stored in the needle plate and not in use, the stopper 6 can block the opening of the hook groove 4, thereby reducing the probability of the yarn accidentally entering the hook groove 4 and being cut. At the same time, since the stopper 6 is installed on the fixed knife 2, when the hook knife 1 starts to needle, the stopper 6 will not affect the hooking of the virtually cut yarn by the hook knife 1.

[0039] Reference Figure 2 、 Figure 3 and Figure 4The cam 7 is fixed on the top of the hook knife 1, and the cam 7 is fixed on the top of the hook knife 1, so that the cam 7 is fixed on the top of the hook knife 1, and the cam 7 is fixed on the top of the hook knife 1.

[0040] Reference Figure 2 、 Figure 5 and Figure 6 , the stopper 6 is slidably arranged on the fixed knife 2, and the stopper 6 slides along the thickness direction of the fixed knife 2. The direction of the stopper 6 on the fixed knife 2 can be changed by sliding the stopper 6, so that the fixed knife 2 can also be applied to both sides of the needle plate; a slider 8 is fixed on the fixed knife 2, and a slide groove 9 is provided on the stopper 6. The slide groove 9 is opened along the length direction of the stopper 6, and the slider 8 is slidably arranged in the slide groove 9. In this embodiment, the cross-sections of the slide groove 9 and the slider 8 are both T-shaped, and positioning members 10 are provided at both ends of the length direction of the slide groove 9; the positioning member 10 includes a pressure block 101 slidably arranged in the slide groove 9 and an elastic member 102 installed between the pressure block 101 and the bottom of the slide groove 9. In this embodiment, the elastic member 102 is a spring. The elastic force of the component 102 drives the pressure block 101 to slide into the slide groove 9, and the pressure block 101 is driven to be flush with the bottom of the slide groove by squeezing the pressure block 101. When the slider 8 slides to the two ends of the slide groove 9 in the length direction, the elastic component 102 drives the pressure block 101 to be pressed on the slider 8. By driving the pressure block 101 to be pressed on the slider 8 by the elastic component 102, pressure can be applied to the slider 8 after the block 6 is positioned, thereby reducing the probability of the block 6 slipping during use; the pressure block 101 has a guide angle 11 toward the center of the slide groove 9. The setting of the guide angle 11 can drive the pressure block 101 before the slider 8 slides to the end of the slide groove 9, thereby reducing the probability of the pressure block 101 affecting the sliding to the end of the slide groove 9.

[0041] Reference Figure 2 、 Figure 7 and Figure 8The thread pressing spring 3 includes a mounting portion 31 fixedly mounted on the needle plate, a rotating portion 32 rotatably arranged on the mounting portion 31, and an elastic portion 33 mounted on one side of the rotating portion 32 in the thickness direction. The elastic portion 33 is a metal sheet with elastic force, and the cut yarn is clamped by the elastic portion 33 and the hook knife 1 to achieve fixation after the yarn is cut. The rotating portion 32 rotates to drive the elastic portion 33 to change direction. The mounting portion 31 is used for fixing the thread pressing spring 3 as a whole on the needle plate, and the elastic portion 33 is used to clamp the cut yarn. The setting of the rotating portion 32 can change the direction of the elastic portion 33 on the mounting portion 31 by rotating, so that the thread pressing spring 3 can act on both ends of the needle plate, thereby improving the applicability of the thread pressing spring 3.A fixing assembly 12 is provided between the rotating portion 32 and the mounting portion 31. The fixing assembly 12 includes an insert rod 121 and a slot 122. The insert rod 121 has two slides respectively set at both ends of the width direction of the rotating portion 32. The slot 122 corresponds to the insert rod 121 and is opened on the mounting portion 31. The insert rod 121 is inserted into the slot 122 by sliding. The setting of the fixing assembly 12 can fix the position of the rotating portion 32 on the mounting portion 31, reducing the probability of the rotating portion 32 rotating during use of the wire pressing spring 3. A driving assembly 13 is provided between the insert rod 121 and the rotating portion 32. The driving assembly 13 includes a mounting slot 1 31, shaft 132, push rod 133, driving rod 134 and reset spring 135, the mounting groove 131 is opened on the rotating part 32, the shaft 132 is fixed on the mounting part 31, the shaft 132 rotates and slides in the mounting groove 131, the push rod 133 is slidably set on the rotating part 32, one end of the push rod 133 is inserted into the mounting groove 131, there are two driving rods 134, one end of the two driving rods 134 is hinged to the end of the push rod 133 away from the insertion groove 131, the two driving rods 134 are hinged to the end of the push rod 133 away from the insertion groove 131, and the ends of the two driving rods 134 away from the push rod 133 are respectively hinged on the insertion rod 121, and the push rod 133 slides The driving rod 134 drives the insertion rod 121 to slide, and the return spring 135 is installed between the top rod 133 and the rotating part 32. The return spring 135 drives the top rod 133 to be inserted into the installation groove 131 through the elastic force. When the top rod 133 extends into the installation groove 131, the insertion rod 121 extends out of the rotating part 32 and is inserted into the slot 122. The rotating shaft 132 includes a rod body 1321 and an anti-slip block 1322. The installation slot 131 includes an insertion slot 1311 and a rotating slot 1312. The rod body 1321 is rotatably and slidingly arranged in the insertion slot 1311, and the anti-slip block 1322 is slidably arranged in the rotating slot 1312. Rod 133 extends through the bottom of rotating groove 1312 and into rotating groove 1312. The top of rotating groove 1312 is a rough surface. Under normal circumstances, anti-slip block 1322 abuts against the rough surface at the top of rotating groove 1312 due to the weight of rotating portion 32. When rotating portion 32 needs to rotate, by lifting rotating portion 32, anti-slip block 1322 slides away from the rough surface and abuts push rod 133, causing push rod 133 to slide away from mounting groove 131. Push rod 133 drives driving rod 134 to drive insertion rod 121 out of slot 122. At this time, rotating portion 32 can rotate on mounting portion 31, adjusting the direction of elastic portion 33.

[0042] The implementation principle of the embodiment of the present application is as follows: according to the installation position of the yarn cutting device on the needle plate of the flat knitting machine, the stop block 6 on the fixed knife 2 is adjusted to slide, the filling block 7 is installed, the cutting opening 5 on the unused side of the hook knife 1 is installed, and the driving rotating part 32 is driven to rotate and adjust the direction of the elastic part 33. After the adjustment is completed, the fixed knife 2 and the thread pressing spring 3 are both installed on the needle plate, and then the hook knife 1 is installed in the needle groove and the hook knife 1 is slidably retracted into the needle groove so that the stop block 6 blocks the opening of the hook groove 4 to complete the installation of the yarn cutting device. When the yarn needs to be cut, the hook knife 1 is driven by the triangle device on the head of the flat knitting machine to raise the needle and hook the yarn to be cut. After that, the triangle device drives the hook knife 1 to reduce the needle and the yarn is cut by the cooperation of the fixed knife 2 and the hook knife 1. At the same time, the cut yarn is fixedly clamped by the hook knife 1 and the thread pressing spring 3, which is convenient for the subsequent use of the yarn.

[0043] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present application with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A knitting needle type yarn cutting device, comprising a hook knife (1), a fixed knife (2) and a thread pressing spring (3), wherein the hook knife (1) is slidably arranged in one of the needle grooves of the needle plate, the fixed knife (2) and the thread pressing spring (3) are respectively fixedly mounted on the needle plate on both sides of the hook knife (1) in the width direction, the fixed knife (2) and the thread pressing spring (3) are respectively abutted against both sides of the hook knife (1) in the width direction, the fixed knife (2) is located on the side of the hook knife (1) facing the center direction of the needle plate, a hook groove (4) is provided on the hook knife (1), and a cutting opening (5) is provided in the hook groove (4), characterized in that: A stopper (6) is installed on the fixed knife (2); when the hook knife (1) is stored in the needle plate, the stopper (6) blocks the opening of the hook groove (4).

2. A knitting needle type yarn cutting device according to claim 1, characterized in that: The hook groove (4) is provided with cutting openings (5) on both sides facing the fixed knife (2) and the wire pressing spring (3); the hook knife (1) is detachably provided with a filling block (7) at the hook groove (4); the filling block (7) is installed on the hook knife (1) to block one side opening of the hook groove (4).

3. A knitting needle type yarn cutting device according to claim 2, characterized in that: The stopper (6) is slidingly arranged on the fixed knife (2), and the stopper (6) slides along the thickness direction of the fixed knife (2).

4. A knitting needle type yarn cutting device according to claim 3, characterized in that: A slider (8) is fixed on the fixed knife (2), a slide groove (9) is provided on the stopper (6), the slider (8) is slidably arranged in the slide groove (9), and positioning pieces (10) are provided at both ends of the slide groove (9) in the longitudinal direction.

5. A knitting needle type yarn cutting device according to claim 4, characterized in that: The positioning member (10) includes a pressing block (101) and an elastic member (102). The pressing block (101) is slidably arranged in the slide groove (9). The elastic member (102) is installed between the pressing block (101) and the bottom of the slide groove (9). When the slider (8) slides to the two ends of the slide groove (9) in the length direction, the elastic member (102) drives the pressing block (101) to be pressed on the slider (8).

6. A knitting needle type yarn cutting device according to claim 5, characterized in that: The pressing block (101) is provided with a guide angle (11) toward the center of the chute (9).

7. A knitting needle type yarn cutting device according to claim 6, characterized in that: The thread pressing spring (3) comprises a mounting portion (31), a rotating portion (32) and an elastic portion (33); the mounting portion (31) is fixedly mounted on the needle plate; the rotating portion (32) is rotatably arranged on the mounting portion (31); the elastic portion (33) is mounted on the rotating portion (32); and the rotating portion (32) rotates to drive the elastic portion (33) to reverse direction.

8. A knitting needle type yarn cutting device according to claim 7, characterized in that: A fixing assembly (12) is provided between the rotating portion (32) and the mounting portion (31), and the fixing assembly (12) comprises an inserting rod (121) and a slot (122). The inserting rod (121) has two inserting rods (121) which are respectively slidably provided at both ends of the width direction of the rotating portion (32). The slot (122) is provided on the mounting portion (31) corresponding to the inserting rod (121), and the inserting rod (121) is inserted into the slot (122) by sliding.

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